Fix #43

[zcfan]

在处理顶层 path 时如果 path.stop() 会导致文件后面所有内容都不再处理。

require() 的语法必定处于一层 ExpressionStatement 下所以没有问题，node_modules 以外的 import 都会被转义为 require() 同样也没问题。

但 node_modules 文件夹下 babel 默认不处理，还保留着 import 语法，调用 stop 就导致跳过了整个 body 的处理。

[codecov-io]

Codecov Report

Merging #44 into dev will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##             dev     #44   +/-   ##
=====================================
  Coverage   85.1%   85.1%           
=====================================
  Files         66      66           
  Lines       1202    1202           
  Branches     320     320           
=====================================
  Hits        1023    1023           
  Misses       136     136           
  Partials      43      43

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